CVE-2026-50248
BOGUS configured primary hostname accepted for XFR in auth/rpz zones
- State
- Published
- Severity
- 6.5 Medium
- Published
- Jul 22, 2026
- Updated
- Jul 22, 2026
- Reserved
- Jun 22, 2026
Description
In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when an auth/rpz zone has a configured primary hostname that resolves to BOGUS A/AAAA, it is still considered as a possible XFR endpoint. A malicious actor that can spoof the hostname's A/AAAA record (no valid RRSIG required) becomes the zone's XFR primary and can replaces the entire zone/the resolver's entire response policy.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 6.5 Medium | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:L | NLnet Labs |
Weaknesses
- CWE-345 Insufficient Verification of Data Authenticity
Affected Products
| Product | Versions |
|---|---|
UnboundNLnet Labs |
|
References
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